Recyclable Poly-Zn3(OAc)4-3,3′-Bis(aminoimino)binaphthoxide Catalyst for Asymmetric Iodolactonization.

On the basis of the structure of the unimolecular Zn3(OAc)4-3,3′-bis(aminoimino)binaphthoxide complex, a poly-Zn3(OAc)4-3,3′-bis(aminoimino)binaphthoxide (poly- Zn) complex was prepared from 3,3′-diformylbinaphthol, tetramine, and Zn(OAc)2. The first-generation poly- Zn catalyst (poly- Zn1) was prepared from poly(aminoiminobinaphthol) and Zn(OAc)2. Although poly- Zn1 showed high catalytic activity for iodolactonization, the catalyst could not be reused. The second-generation poly-Zn catalyst (poly- Zn2) was prepared by the self-organization of 3,3′-diformylbinaphthol, tetramine, and Zn(OAc)2. This produced a stable and active poly- Zn2 catalyst for asymmetric iodolactonization that was reused over five cycles. [ABSTRACT FROM AUTHOR]